Idioma:

Nonrelativistic Dynamics of the Amplitude (Higgs) Mode in Superconductors

Cea, T ; Castellani, C ; Seibold, G ; Benfatto, L

Physical review letters, 2015-10, Vol.115 (15), p.157002-157002, Article 157002 [Periódico revisado por pares]

Texto completo disponível

Citações Citado por

Título:
Nonrelativistic Dynamics of the Amplitude (Higgs) Mode in Superconductors
Autor: Cea, T ; Castellani, C ; Seibold, G ; Benfatto, L
Assuntos: Amplitudes ; Analogies ; Disorders ; Dynamics ; Fluctuation ; Joining ; Order parameters ; Superconductors
É parte de: Physical review letters, 2015-10, Vol.115 (15), p.157002-157002, Article 157002
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
Descrição: Despite the formal analogy with the Higgs particle, the amplitude fluctuations of the order parameter in weakly coupled superconductors do not identify a real mode with a Lorentz-invariant dynamics. Indeed, its resonance occurs at 2Δ_{0}, which coincides with the threshold 2E_{gap} for quasiparticle excitations that spoil any relativistic dynamics. Here we investigate the fate of the Higgs mode in the unconventional case where 2E_{gap} becomes larger than 2Δ_{0}, as due to strong coupling or strong disorder. We show that also in this situation, the amplitude fluctuations never identify a real mode at 2Δ_{0}, since such a "bosonic" limit is always reached via strong mixing with the phase fluctuations, which dominate the low-energy part of the spectrum. Our results have direct implications for the interpretation of the subgap optical absorption in disordered superconductors.
Editor: United States
Idioma: Inglês

Links

Voltar para lista de resultados

Resultado 1